National Repository of Grey Literature 5 records found  Search took 0.00 seconds. 
Optical properties of the GaN on sapphire
Skalský, Miroslav ; Janta, Jiří ; Čtyroký, Jiří ; Stejskal, J. ; Hüttel, I.
The method of mode spectroscopy was used to measure optical properties of epitaxial layers of gallium nitride (GaN) deposited onto the sapphire substrate. The results of the measurement of the layer thickness, refractive indices, and the attenuation of guided modes at the wavelengths of 632.8 nm and 781 nm are presented. From experimental values of attenuation of different guided modes, the contributions of bulk absorption and scattering at the interfaces of the layer to the total optical loss in the waveguide are determined.

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